Kolbeckite

phosphate

hübnerite

Formula: Sc(PO4).2H2O hydrated normal phosphate, variscite group
Specific gravity: 2.35
Hardness: 3 to 5
Streak: White
Colour: Colourless, light yellow; when impure: cyan-blue, blue-gray, apple-green
Solubility: Decomposed by acids
Environments:

Hydrothermal environments

Kolbeckite is a very rare secondary mineral in phosphate deposits and some hydrothermal veins. It is found in a quartz hübnerite-ferberite vein at the type locality, the Sadisdorf copper mine, Saxony, Germany (Dana).

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